Huancayo, Peru
Huancayo neutron monitor was operated by Enrico Fermi Institute University of Chicago and later of Institute for the Study of Earth, Oceans, and Space
Specifications:
| Detector | 12IGY |
| Geographic latitude | 12.03° S |
| Geographic longitude | 75.33° W |
| Altitude | 3400 m asl |
| Effective vertical cutoff rigidity (Epoch 1965.0) | 12.9 GV |
| In operation | 1951 - 1992 |